Ejecting device for the folding mandrels of paper bag-making machines



April 7, 1931. p GANGLER 1,799,845

MAKING MACHINES EJECTNG DEVICE FOR THE FOLDING MANDRELS OF PAPER BAG Filed Aug. 9, 1929 'mn/ENTOR;

' Patented Apri. 7,1931` UNITED. STATES ,PA'IEN'I OFFICE PAUL GANGLEB, -OF ESSLINGEN, GERMANY, ASSIGNORITO THE FIRM FR. BESSER.

MASCHINENFABBIK-AKTIENGESELLSCHAFT, F STUTTGART-CANNSTATT, GER- HANY . EJECTING DEVICE FOR. 'IHE FOLDING MANDRELS OF PAPER BAG-MAKING MACHINES Application led August 9, 1929, Serial No. 384,536, and in Germany August 29, 1928.

.My invention relates to improvements in machines for the manufacture of bags from paper, cardboard or other suitable materials, and more particularly to machines of that type in which thebag ismade on folding mandrels, which are in succession presented to the devices serving for the formation of the bag on the folding mandrels.

My invention consists of an improved -de vice for removing the finished bag from its mandrel. Hitherto an ejecting plate was generally used for this purpose, which had substantiallythe size of the entire front face of the folding mandrel. This plate fits into a countersunk portion recessed in the front` face of the mandrel, said recess corresponding with the size of the said ejecting plate and simultaneously as a stop or abutment for limitingthe inward movement of the plate which is joined to a rod guided in lthe interior of the mandrel. By means of this rod, the ejecting plate is during the ejecting process advanced b the distance necessary for stripping -the ished ba oif the mandrel and is then again drawn ack into the countersunk portion at the front end of the mandrel.

An essential drawback of the known ejecting devices of this typle is that during the return movement of t e ejecting plate the paper bag is liable to 'be pulled back again by a certain'amount and to be Iclamped between the ejecting plate and the said countersunk portion at the front end of the mandrel, whereby the operation is disturbed and breake downs may be caused in the machine.

TheA object of my invention is to simplify the construction of theejecting device and to eliminate the said drawback. In order to 40 realize this object, the ejecting plate and the countersunk portion 4at the front end of the mandrel .have been eliminated by providing a rod or tube -of as large a cross-sectional aren. as possible for ej ecting or stripping the bag from or olf the mandrel, such rod being adapted to be moved axially within the mandrel in a similar manner to the rod of the ejector plate used heretofore, but extending with its front end up to the front face of the mandrel and terminating Hush with it, so that the front end of the rod forms part of the front face of the mandrel and directly serves for stripping the bag off the folding mandrel. Instead of one rod, two or more rods presenting together as large a crosssection as possible may be used.

Some embodiments of my invention are illustrated by way of example in the accompanying drawing, in which Y Fig. ,1, shows a longitudinal section through one embodiment, Y

' Fig. 2, a cross-section along line a-b of Fig. 1,

Fig. 3, a modification,

FFig. 4, a cross-section along line o-d of 1g. 3

Fig. 5, a further modification, and

F- Fig 6, a cross-section along line ef of Like parts are indicated by like reference characters throughout all the figures of the drawing.

In the present case a part of a paper bag making machine has been illustrated in which the folding Imandrels 1, one of which is only shown in each longitudinal section in the drawing, are secured in the well known and usual manner on a disc 2 in the fashion of the spokes of a wheel. As is also well known to those skilled in the art, said disc 2 is intermittentl rotated by means of a suitable known rive operating a shaft 3 journaled in a suitable bearing 4 of the machine framing so that the folding mandrels reach in succession suitable and well known devices by means of which the blank, for instance a sheet of paper, is first folded around-the mandrel to form a tube and the longitudinal edges of saidv tube are cemented to ether to form the longitudinal seam of the ag, and 00 then the bottom of the bag is produced on the front face of the mandrel.

For ejecting the thus finished bag P, I rovide in the embodiment illustrated in l igs. 1 and 2 a tube 5 which referably has as ar sli able in the hollow mandrel 1, for instance within suitably shaped inward extensions 8. The tube 5 is with its inner. end mounted upon the horizontal branch or projection 6a of a block 6 adapted to be moved axially in a longitudinal slot 7 of the mandrel. For sliding the block 6 with the tube longitudinallywithin the mandrel an extension 6b is provided which during the rotation of the mandrel wheel is guided in a suitable annular oove 9 of the bearing 4` at all working stations with the exception of the ejecting Station. Only at this ejecting station, the fork-sha ed end 11* of a rod 11 extends in the well own manner into a corresponding recess of the guide track 4*. Said rod 11 is operated by well known driving" and controlhng means so as to effect the necessary outward and inward motions of the block 6 and thus of the ejector tube 5. At its front end, the ejector tube is closed by a lid-like disc 12 which lies Hush with the front face 1R of the folding mandrel 1, so that the lid 12 forms a uniform abutment surface with the remainin front face 1 of the mandrel.

uring the rotation of the mandrel spider, the rod 11 with the fork 11 is located in its inner position shown in Fig. 1 in full lines. At the ejection station, the projection 6b of the block 6 passes from the gulde groove 9 into the fork 11, and the outward motion of the tube 5 takes place into the position shown in broken lines on the right-hand side of Fig. 1 by means of the rod 11 and the block 6. 'Izhe ba P is thereby stripped olf the mandrel 1 and paced on the tray or other support 19.

The ejector tube 1 is then pulled back by the rod 11 into its inner position. 'lhe inward stroke of the ejector tube 5 is limited by a projection 6 of the block 6 which encounters the bottom wall of the hollow mandrel 1. It will be understood that the tube might be replaced by a full rod and that the tube or rod might also have another cross-section than a circular one.

In the modification illustrated in Figs. 3

and 4, two flat bars or rails 14B and 14 are 4suitable em loyed instead of the tube 5. Said bars or rai are at their inner ends secured to the said block 6 which is operated in the same manner as described with reference to Fi 1. The .rails are guided at the top in longitudinal grooves 16 of suitable projections 17 and at the bottom in angular recesses 2O of rojections 21 of the hollow mandrel 1. At the front end, the fiat rails 14ll and 14" extend to the front face of the folding mandrel and lie iush with it. The mode of operation is the same as described with refa diameter as possib e and is axially erence to the construction shown in Figs. 1 and 2.

In the modification of my invention illustrated in the Figs. 5 and 6, two rods 18 and 18b one above the other are provided for ejectino' or stripping the bag off the mandrel. 2t their inner ends, the two rods are secured to the block 6, while the front ends of the two rods lie Hush with the front face of the mandrel 1. In this case, the extension 18c of the rod 18b serves as a stop for limiting the inward motion of both ejector rods. The mode of operation of this modification is also equal to that described with reference to the construction illustrated in Fig. 1.

It will be understood that accordin to the size and the cross-section of the fol 'ng mandrel it is also possible to employ more than two rails or rods in suitable relative arrangement, and that various other changes may be made without departing from the spirit of my invention.

' I claim as my invention l 1. In an ejecting device of the type specilied for the folding mandrels of paper bag making machines, rod shaped ejecting means extendinflr with the operative end u to and liush with the front face of the folding mandrel and adapted to be axially reciprocated within said mandrel.

2. In an ejector device of the type specified for the folding mandrels of paper bag making machines, rod shaped ejecting means extending with the operative end u to and flush with the front face of the folding mandrel and guided in said mandrel for axial movement, and means adapted to hold said rod shaped means and to be reciprocated axially within said mandrel, said holding means consisting of a block-like iece guide for axial reciprocation in a longltudinal slot in the wall of the hollow mandrel and having a projection adapted to be engaged by the reciprocating driving means and another projection a apted to abut in the inner position of the rod-shaped ejecting means against a stop of the mandrel.

3. In an ejecting device of the type specilied for the folding mandrels of paper ba making machines', a smooth ejecting rod o relatively large diameter extending with 'its front operative end up to and flush with the front face of the folding mandrel and adapted to be axially reciprocated within said mandrel. f

4. In an ejectingrdevice of the type specified for the folding mandrels of paper bag making machines, rod shaped ejecting means extending with the operative end up to and iush with the front face of the folding mandrel and adapted to' be axially reciprocated within said mandrel, said rod shaped means consisting ofahollow tube having `a closing lid at itsfront end.

les

5. In an ejecting device of the type specied for pag-$11' bag making machines having i hollow fol gmandrels means extendln with the o erative end up to and flush wit the front ace of the folding mandrel and adapted to be axially reciprocated within said mandrel, said rod shaped means consisting of a hollow tube of relatively large diameter and guided for axial reciprocatlon between inner projections of rod shaped ej ecting V the mandrel wall.

In testimony whereof I have aiiixed my signature.

PAUL GANGLER. 

